You'll see a few enemies on the ground and two on the
stairs, select the black slimy spot, throw a rock at the enemies on the stairs
and kill them all.

(if you want the level achievements, this is a very
good place to do so because they respawn quickly, but
it really takes forever, I didn't had the patience for it, so I went on.)

Go up the stairs at the left, only go up one piece,
let the majin kneel at the top left, jump on the wall
and walk to the left, open the treasure chest, walk another piece
of the stairs, then look at your right, there is a pillar with slimy stuff on
it, select it, jump on it, jump two more pillars to the left, jump to the
platform, there is a treasure chest with a piece of
clothing.

Go back to the majin, go up
the stairs at the left, this is a very annoying part, I don't know if this is
the right way, but it works for me.

To the right
you'll see a wheel on the other side, but you can't reach it, when you look
down, there is a path, the memory shard will be here when it's
dark.

Go to the left, you'll see two enemies with those
twisting arms and two shielded enemies, but the majin
can't get there, so you'll need to extend the bridge on the right.

Select the pillar in front of you, you can now jump on
it, walk around until you reach the other side with the barrels, jump to the
platform where the rat and the wheel are, turn the wheel, the majin can now join you, select the ground where the enemies
with the twisting arms are, you can now walk normal on this floor, kill all the
enemies.

There is still one enemy on a ledge, you can reach him
by going onto the pillar (where
you started this part), walk
around, jump over towards him.

When you're on the platform with this enemy, look to
the right platform, there is a glowing red fruit, go there by
letting the majin kneel and pick it up.

Go to the right, there is a big door and a wheel,
select the black slimy spot in front of the wheel, turn the wheel and the door
is open.

Immediately to the right outside the door is a rocky
platform you can climb, open the treasure chest.

Follow the path to the next door, save you progress if
you want and pick up the fruit flower if you need to.